Compound spray nozzles



28, 1956 J. E. KENNEY 2,760,821

COMPOUND SPRAY NOZZLES Filed April 5, 1954 INVENTOR. JUHN E, K ENNEY ATTURNE 2,760,821 a COMPOUND SPRAY NOZZLES John E. Kenney, Menlo Park, Califi, assignor of fifteen per cent to Alfred L. Kenworthy, Redwood City, Calif.

Application April 5, 1954, Serial No. 420,784

1 Claim. (Cl. 299-86) This invention relates to improvements in spraying devices and has particular reference to that type in which semi-liquid paints or insecticides are employed and pressure is utilized to force the semi-liquids through a nozzle.

An object of the present invention is to provide steam for producing the required pressure for accomplishing the spraying and to construct a spray gun in such a manner as will provide a suction chamber therein for drawing fluid, from a container, into the gun and to further provide means for causing the fluid drawn therein, to be forced, by the steam pressure, through a nozzle positioned on the gun, whereby the said fluid is sprayed out of the gun to a remote point.

Another object of the present invention is to construct the gun of a suitable pipe or tubular casing and to provide an elongated circular core therein, which core is formed with a tapered receding passageway for conveying the steam pressure to and through the fluid receiving chamber, whereby the liquid is mixed with the steam vapor and forced through a nozzle mounted on the outer end of the gun.

The invention further consists in the particular combination, construction and association of the dilferent parts such as described in the following specification and possesses other objects and features of advantage as set forth in the claim.

In the accompanying drawing wherein for the purpose of illustration like numerals designate like parts throughout the same,

Fig. 1 is a central longitudinal sectional view of the gun shown positioned above a material holder container and in communication therewith,

Fig. 2 is a vertical sectional view taken on line 2--2 of Fig. 1, looking in direction of the arrows toward the steam pressure inlet of the gun.

Fig. 3 is a vertical sectional view of the gun barrel and material suction tube thereon taken on 1ine- 33 of Fig. 1, looking in direction of the arrow 3 toward the outlet of the gun,

Fig. 4 is an outer end elevational view of the gun barrel and the spray nozzle thereon, and

Fig. 5 is a side elevational assembly view of the heating means and steam boiler provided for supplying the steam pressure employed in the invention for spraying the fluid.

Referring in detail to the drawing and numerals thereof, the numeral 7 designates a cylindrical casing, forming the gun barrel, and the numeral 8 designates, as a whole, an elongated tube positioned therein, which tube is threadedly secured, at the inner end portion of the barrel, as at 9, and is firmly supported therein, at the outer flange portion 10, as disclosed to advantage in Fig. 1. A second flange 11 is spaced'in front of the said flange 10, whereby a chamber 12, hereinafter termedthe mixing chamber, is formed within the casing. The said flange 11 is provided, around the center thereof, with a series of apertures 13, equally spaced one from the other and each formed at a downwardly extending angle in 2,760,821 Patented Aug. 28, 1956 2 the said flange 11, andare capable of receiving a plurality of small tubes14, which tubes are rigidly fixed thesaid apertures .as shown in Fig.1. The outer end vportionof the said casing 7. is internally threaded as at 15, for receiving an externally threaded core 16, the said core 16 being circumferentially grooved as at 17 and formed with a chamber 18. The front end of the said core 16 is formed with a threaded opening 19 into which the nozzle 20 is secured. A plurality of radially extending air inlet tubes 21 are fixed in the casing 7 and positioned around the said circumferential groove 17 for conveying air therein.

The numeral 22 designates a vertical tube threadedly secured to the casing 7 and leading from the mixing chamber 12 therein and into a container 23 and removably secured thereto. The container may be supplied With ordinary spray paint, liquid dust paint, an insecticide, or any kind of spraying material, and supported on a table 24 or carried with the gun if desired.

The numeral 25 designates a steam boiler of any suitable size or shape and is illustrated in Fig. 5 as being positioned on a conventional gas or electric stove 26 and provided with a removable cover 27 and a steam outlet flexible tube 28, fixed to a metal bushing 29, secured to I the boiler as shown in Fig. 5. The said tube 28 is also illustrated in Fig. 1 with the front end portion thereof fixed to a steam inlet bushing 3.0, which bushing 30 is threadedly secured to the casing inner tube 8, whereby the said flexible tube 28 leading from the steam boiler is connected to the spraying device and is capable of being carried therewith. A hand operative valve 31 is provided on the inlet bushing 30 for controlling the flow of steam in the tapered passageway 32 formed within the inner core or casing tube 8. This receding tapered passageway 32 increases the velocity of the steam in its travel to the nozzle, thus increasing the mixing efi'iciency in the chamber 12 and also causing the spray to travel a greater distance out of the nozzle. It is obvious that the steam will rapidly cool after it passes through the nozzle and within a few inches thereof. The said nozzle is preferably of the adjustable expansion type, but can be any suitable make that will serve the purpose of the invention. A manually controlled shut off valve 33 is fixed on the vertical tube 22 and positioned thereon above and against the top of the container 23 and is secured to a conventional nipple 34 threaded into the casing 7 and leading into the mixing chamber 12. The numeral 35 designates a handle for operating the valve 33 and shutting off or closing the same and thereby controlling the supply of fluid from the container 23. A conventional needle valve may be provided in the said tube if desired for controlling the flow of fluid supplied to the gun.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the shape, size, material and arrangement of parts may be readily resorted to without departing from the spirit of the invention or the scope of the subjoined claim.

Having thus described my invention, I claim:

In a spraying device the combination with a container holding a quantity of spraying material and an elongated cylindrical casing connected to the container and in communication therewith, a tube formed with a tapered receding passageway mounted within the casing and threadedly secured thereto, the outer periphery of the tube being circumferentially grooved in proximity to the outer end portion thereof, defining a chamber, an inlet leading through the wall of the casing to said chamber, a flange formed around the tube at the front extremity of said chamber, a series of minute tubes extending downwardly through said flange, a core threadedly secured in the outer end portion of the casing and positioned in front of said flange and the minute tubes, the saidcore being formed with a receding cavity providing a second chamber, said core being circumferentially grooved around the cavity, a series of air inlet tubes extending through said casing to the groove, a nozzle threadedly secured in said core and spaced in front of the cavity and circumferential groove, and a plurality of air outlet passageways leading from the groove to the space at the rear of the nozzle.

References Cited irilthe file of this patent 2,319,591 Ferguson May 18, 1943 

